(69988) 1998 WA31

(69988) 1998 WA₃₁

Discovery
Discovered by	Marc W. Buie
Discovery date	18 November 1998
Designations
MPC designation	(69988) 1998 WA31
Minor planet category	TNO 2:5 resonance[1]
Orbital characteristics[2]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 3
Observation arc	3714 days (10.17 yr)
Aphelion	78.463 AU (11.7379 Tm)
Perihelion	31.535 AU (4.7176 Tm)
Semi-major axis	54.999 AU (8.2277 Tm)
Eccentricity	0.42663
Orbital period	407.89 yr (148980 d)
Mean anomaly	43.430°
Mean motion	0° 0^m 8.699^s / day
Inclination	9.4748°
Longitude of ascending node	20.817°
Argument of perihelion	309.41°
Earth MOID	30.5307 AU (4.56733 Tm)
Jupiter MOID	26.5469 AU (3.97136 Tm)
Physical characteristics
Dimensions	139 km[3]
Geometric albedo	0.09 (assumed)
Absolute magnitude (H)	7.4

(69988) 1998 WA₃₁, also written as (69988) 1998 WA31, is a trans-Neptunian object that resides in the Kuiper belt.^[4] It was discovered on 18 November 1998 by Marc W. Buie at the Kitt Peak National Observatory.

It is in a 2:5 orbital resonance with the planet Neptune.^[1]

References

1. Marc W. Buie. "Orbit Fit and Astrometric record for 69988" (2000-12-28 using 22 of 24 observations). SwRI (Space Science Department). Retrieved 2009-01-29.
2. "JPL Small-Body Database Browser: 69988 (1998 WA31)". NASA/Jet Propulsion Laboratory. Retrieved 6 April 2016.
3. Wm. Robert Johnston (22 August 2008). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 2009-01-29.
4. "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. Retrieved 2009-01-29.

External links

• (69988) 1998 WA31 at the JPL Small-Body Database

• Discovery · Orbit diagram · Orbital elements · Physical parameters